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Investment Properties - Summary of Investment Properties Provided as Collateral (Detail) - Land and buildings [member] - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Deposits 1 [member]    
Disclosure of detailed information about investment property [line items]    
Carrying amount ₩ 854,874 ₩ 548,567
Secured amount ₩ 62,896 ₩ 66,551
Related account Deposits Deposits
Related amount ₩ 56,831 ₩ 59,492
Borrowings [member]    
Disclosure of detailed information about investment property [line items]    
Carrying amount 1,915 5,292
Secured amount ₩ 3,044 ₩ 3,987
Related account Borrowings Borrowings
Related amount ₩ 1,903 ₩ 3,322